<template>
  <div class="bottom-menu">
    <CheckButton class="select-all"
                 @checkBtnClick="checkBtnClick"
                 v-model="isSelectAll">
    </CheckButton>
    <span>全选</span>
    <span class="total-price">合计: ¥{{totalPrice}}</span>
    <span class="buy-product" @click="calcClick">去结算({{checkLength}})</span>
  </div>
</template>

<script>
import CheckButton from './CheckButton'
export default {
  name: 'CartBottomBar',
  components: { 
    CheckButton
   },
  computed: {
    totalPrice() {
      const cartList = this.$store.getters.cartList
      return cartList
        .filter(item => {
          return item.checked
        })
        .reduce((preValue, item) => {
          return preValue + item.count * item.price
        }, 0)
        .toFixed(2)
    },

    checkLength() {
      return this.$store.getters.cartList.filter(item => item.checked)
                                         .reduce((preValue, current) => {
                                           return preValue + current.count
                                         }, 0)
    },

    isSelectAll() {
      return(
        this.$store.getters.cartList.find(item => item.checked === false) === undefined
      )
    }
  },
  methods: {
    checkBtnClick() {
      let isSelectAll = this.$store.getters.cartList.find(item => !item.checked)
      if(isSelectAll) {
        this.$store.state.cartList.forEach(item => item.checked = true)
      }else {
        this.$store.state.cartList.forEach(item => item.checked = false)
      }
    },

    calcClick() {
      if(!this.checkLength) {
        this.$toast.show("请选择购买的商品", 2000)
      }
    }
  },
};
</script>

<style scoped>
  .bottom-menu {
    width: 100%;
    height: 44px;
    background-color: #eee;
    position: fixed;
    bottom: 50px;
    left: 0;
    box-shadow: 0 -2px 3px rgba(0,0,0,0.2);
    font-size: 14px;
    color: #888;
    line-height: 44px;
    padding-left: 35px;
    box-sizing: border-box;
  }

  .bottom-menu .select-all {
    position: absolute;
    line-height: 0;
    left: 12px;
    top: 13px;
  }

  .bottom-menu .total-price {
    margin-left: 15px;
    font-size: 16px;
    color: #666;
  }

  .bottom-menu .buy-product {
    background-color: orangered;
    color: #fff;
    width: 100px;
    height: 44px;
    text-align: center;
    line-height: 44px;
    float: right;
  }
</style>